Is there any javascript ssh client?

Not pure HTML5, but there are other online (html/js/css based)

  • Firessh
  • Webshell (no longer resolves as of 06/2016)
  • sshterm (no longer resolves as of 06/2016)

Not in JavaScript that I know off, but you can run a python script on the server that will provide you with an ssh-shell in a browser.

GateOne